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Download Informer, via The Windows Club website, released a unique app for Windows 8 users. This app is called Windows 8 Aero Lite Tweaker. This free and portable utility will let you enable glass in Aero Lite theme.Windows 8 is still in the developmental stage and some features are sure to change till the time its final Windows 8 RTM version is released.
We recommend that you backup the original theme before enabling the Aero Lite theme as there currently appears to be no way of reversing the changes